[2008] Object Ref Not Set When Row Not Found - EXECUTESCALAR
Feb 22, 2009
I've got this
Public Function VendorIdOf(ByVal SimpleId As String) As String
Dim result As String = Nothing
Using drc As New SqlCommand("Select VendorId From Vendor_T Where SimpleId = @SimpleId", _connection)
[Code]....
"Object reference not set to an instance of an object."
Why is that? I would expect a null value to be returned if the row does not exist.
Also - out of curiosity - how come this can be written two ways?
result = drc.ExecuteScalar().ToString()
or
result = drc.ExecuteScalar.ToString
What's up with those paren's?
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Dec 31, 2009
Occasionally I encountered this exception message while trying to download file from a server using System.Net.FtpWebRequest and System.Net.FtpWebResponse Object.
Download a file.ftpRequest_DL.Method = WebRequestMethods.Ftp.DownloadFile get the response object
Dim ftpResponse_DL As FtpWebResponse = CType(ftpRequest_DL.GetResponse, FtpWebResponse)
[Code]...
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May 24, 2009
I get an error while trying to install a third party Excel add-in [Thomson One Analytics]. Error: "Compile error in hidden module: Main" Microsoft Excel 2003..But when I had the Addin unlocked.I noticed that it was getting stuck at a specific line in the MAIN module of the Addin package and the debugger throws a compile error message saying that: "Object library Invalid or contains references to object definitions that could not be found". Earlier when I had this issue,I made another user login to the PC and we were able to use the add-in successfully. But this time even a different user with Admin Rights was not able to use it. [code]
Tried to install and run the Addin on the same computer by a different user having admin rights, no go.Made sure that he references for the add-in in the VBA editor are correct, by comparing them with a working computer, no go Re-installed "Service Pack 6 for Visual Basic 6.0: Run-Time Redistribution Pack (vbrun60sp6.exe)", no go. Ran repairs on Excel, no go Re-installed Excel, no go
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Mar 11, 2009
following error message:
Method not found: Void Excel.Range.set_Value(System.Object,System.Object)
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Sep 3, 2009
After reading all the examples for list of T exists and Find and find first, none show how to handle multi-property objects. Below is bare bones example maybe someone could flesh out to show how this should be done.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim DatePriceList As New List(Of DateAndPrice)
DatePriceList.Add(New DateAndPrice(Date.Parse("1/1/2000"), 10.12))
DatePriceList.Add(New DateAndPrice(Date.Parse("1/2/2000"), 11.12))
[Code]...
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Nov 11, 2010
I am trying to use a simple LINQ to Objects query.When I try to run my application I get the message:
System.InvalidOperationException was unhandled Message="An error occurred creating the form. See Exception.InnerException for details. The error is: Method not found: 'Void sharatTashlumimWS.paymentDetailsManager.set_ReleaseDate(System.DateTime)'."
Source="WindowsApplication1"
StackTrace:
[Code]...
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May 9, 2012
I have the code below giving me grief because it gives unknown error (0x80005000) when trying to add a user to a second group[code]...
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Jun 4, 2010
My HP 6730b laptop is running on XP Pro sp3 and is a downgrade from Vista. When I use LonMaker control development software with a Phoenix Controls application called LVCDiagnostic, I will get the error listed above. This error does not exist in the Microsoft knowledge base.
Phoenix Controls tech support said that about one out of 25 laptops that show up with trainees at the factory have this problem. They suggested a reload of the os then a reload of LonMaker followed by a reload of their application package. The cd that came with my laptop for reloading the OS will not work - it can't find a file and aborts the operation. I have found a service that can reload the OS and then I will continue with the other reloads.
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Jan 12, 2012
I have got this error No default member found for type 'VB$AnonymousDelegate_0(Of SqlDataReader,String,Object)'.
My Code is below
dsBranch.Tables.Add(GetDataTableFromSQLReader(dr, "")) - Calling
Private Function GetDataTableFromSQLDataReader(ByVal dr As SqlDataReader, ByVal TableName As String)
[code]....
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Nov 30, 2011
I am working on a login page for an asp.net application. I'm making my own login and everything is working so far: I get a connection, the query is asking to return Count from the table where the username and password match the username password in the table.
[Code]...
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Nov 28, 2011
It worked fine till i applicated some conditions... Now my form execution stop right after a ExecuteScalar.[code]
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Jun 1, 2011
I have a Stored Procedure which returns 10 columns of data. Using cmd.ExecuteScalar() returns the value of the 1st column from the 1st record. How can I change this so that I can return different columns, by specifying their alias/dataitem name?
I want to be able to do something like: Dim FirstName as String = cmd.ExecuteScalar("FirstName")
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Mar 15, 2012
show me how to do an insert with EF4 VB and also how to return the ID of the inserted row?This is what I have got for edit and it works.. I have seen some very confusing ways of doing selects and edits and have found that i'm most comfortable keeping it written nice like this so that I can go back and understand what I have done.
[Code]...
I want to insert a new order with an order_id and value for ExportedToOW and get the order_id back which is auto generated by the DB..
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Nov 3, 2011
Why i got this error ?? ExecuteScalar: Connection property has not been initialized
the red section got error.
my code
Dim sql As String
Dim sql1 As String
Dim sql2 As String
[Code].....
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Apr 17, 2009
i tried this sqlcommand select max(food) from foods and i tried this dim x as double=cdbl(cmd.executescalar)and it throws the the exception {System.Invalid CastException}because the food table is empty and the max(food) is null how can i fix that because i want to take the value and add one to it so do i need to catch the error or try another conversion option?
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Nov 18, 2009
currently, I use this code:
[Code]...
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Jun 4, 2010
I have an sp that deletes a bunch of rows and returns the number of rows deleted...
ALTER PROCEDURE [dbo].[DeleteChangeLog]
@ChangeEntityType bigint,
@StartDate datetime,[code]......
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Feb 3, 2011
I'm trying to get the AutoID after inserting a record in to a DB. Does this code look right as Mydata is blank afterwards?
[Code]...
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Jul 8, 2011
I have a big stored procedure that I run. At the end its supposed to select a singe value to say if it succeeded or not, so I run the query as
Dim Command As New SqlCommand(SqlString, Conn)
Return Command.ExecuteScalar()
Which works. However there is an error in my stored procedure. I know its causing an error because the logic in the stored procedure rolls back the transactions, and after the Execute Scalar call, my transaction count is down to 0 and the my data hasn't changed. However no SQL exception was generated.
The strange part is, I changed the code to grab all the result sets from the SP to see if I could get more information. So I called the same SP like this,
Dim DAObj As SqlDataAdapter = New SqlDataAdapter
Dim CommandObj As SqlCommand = New SqlCommand(SQLString, Conn)
DAObj.SelectCommand = CommandObj
Dim DS As New DataSet()
DAObj.Fill(DS)
When I run this, with the exact same sql as before, executing the exact same stored procedure, this time I get an SQL exception because one of my nested SP calls was missing required parameters. So what could cause this? Why would running it one way produce an error and the other way have the error but not report it? Is the difference on purpose, or some kind of obscure bug in ADO.Net?
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Sep 19, 2011
How do I implement the ExecuteScalar method to return the first element in a sorted dataset?
Here is my code:Imports System.Data.OleDb
Sub Dim oCmd As OleDbCommand
Dim strConn As String
Dim strQuery As String
strConn &= "Provider=Microsoft.Jet.OleDb.4.0;"
[Code]...
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Oct 1, 2010
We have an VB.net application that is being moved from one box to another. It runs great on the old box. The new box is configured the same as the old one but is on newer hardware. When I run the application on the new server it complains that the adobe toolkit that we use can not be found.
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Aug 16, 2009
i want to compare a column present in the access database BankAccount table with a field present in the form named as account......
[Code]...
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Apr 8, 2009
When I'm working in 2005 All the Libarys look like they are there however when I'm working with 2008 It looks like the The Whole Thing Was Narrowed Down to about 3 Namespaces any Suguesttions On Why or How this is happening?
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Aug 21, 2009
I getting an error which is:
Error 1 Task failed because "AL.exe" was not found, or the correct Microsoft Windows SDK is not installed. The task is looking for "AL.exe" in the "bin" subdirectory beneath the location specified in the InstallationFolder value of the registry key HKEY_LOCAL_MACHINESOFTWAREMicrosoftMicrosoft SDKsWindowsv6.0A. You may be able to solve the problem by doing one of the following:
1) Install the Microsoft Windows SDK for Windows Server 2008 and .NET Framework 3.5.
2) Install Visual Studio 2008.
3) Manually set the above registry key to the correct location.
4) Pass the correct location into the "ToolPath" parameter of the task. OutlookBar v2 2005.
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Jan 6, 2010
I have a solution which upon a button push, loads a PDF into the application for viewingThe loaded PDF is an index page linking to other PDFs. This all came off a CD of a VendorMy client want me to create a "Job Book" of all the CDs from these vendors.Here is the issue.When select the button for a particular document, the front page of the PDF (Index Page) load fine. The loaded PDF has buttons as links to the various pdfs so when I select a button within the loaded PDF I get a message stating it cannot find the pdf requested. The buttons within the index pdf are all set to relative path so all the folders should be available. but alas the program does not find them.
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Sep 27, 2009
Created for Bill Smith Bill Smith 100 Maple St. Nowhere, MI 49091 Program Information undecided about Your Career Path? I can find the position where "Created for" occurs in the string
VB
Private Function FindText(ByVal strText As String) As String
Return InStr(strText, "Created for")
End Function
I am trying to get the first and last name that occurs right after the "Created for" in that string but I have not found a good way to do so. Essentially there are multiple files in a directory that I am spinning though and changing the name of the files to match the name in the file.
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Jul 16, 2010
Once again I've ran into a (at least for me) weird problem, which I can't figure out.I have a form which allows users to send an email with an attachment and also stores the email in an accessdatabase. When sending an email without an attachment, there is no problem and all is saved to the database.
But when sending an email with an attachment, it produces an error that the database is not found, and therefore nothing is saved to the database.
[Code]...
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Feb 19, 2010
I have a crawling program that fetches urls to parse the html and came across an unusual error since I started this. For a specific set of urls from a site when fetching using HTTPWebRequest and HTTPWebResponse I get the error The remote server returned an error: (404) Not Found This is unusual since it works when pasting it in my browser. Not sure if code is needed to posted but let me know if so.
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Jul 24, 2009
I am printing my form by using the printdocument of VS and the printform found in powerpacks. I never got the preview to work so when ever I want to print I send my information on a new form (form1) which I have altered ( colour borders ) so it is printable. To print form1 I have added a toolstrip with a print button so when the user sees all is ok on the form1 he clicks on it which hides the toolstrip and prints form1. All this sequence works fine. The problem I have been getting lately is that I can print on the first try but when I call another form to print the toolstrip ( with the print button ) is always hidden. I have to exit the application and re enter to get it to show up. Any solution to this or even how to print in a better way. (have the preview to work for example ). I have tried to use printdialog to print but I have never been able to send the document to print.
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Mar 27, 2010
Sometimes webbrowser goes to page not found and stops. Is there a way to do if it's page not found do refresh!
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